The Insulation Pipe Covering,thermal, cataloged under National Stock Number 1660-01-167-5221, is classified within Federal Supply Class 1660 (Aircraft Air Conditioning, Heating, and Pressurizing Equipment) of the Aircraft Components and Accessories group. The manufacturer of record is Arrowhead Products Corp. The record lists 1 manufacturer part number for this item, enabling identification through both NSN and commercial part number lookups. 1 additional reference document (drawings, advisory and superseded references) is recorded in the U.S. Government catalog. 1 item shares a part number with this NSN in the catalog (possible match — not a government interchangeability claim). Current acquisition status: Active.
| Parameter | Value |
|---|---|
| NSN | 1660-01-167-5221 |
| Primary Part Number | 400771-2 |
| Item Name | Insulation Pipe Covering,thermal |
| FSC / FSG | 1660 / 16 — Aircraft Air Conditioning, Heating, and Pressurizing Equipment |
| Manufacturer | Arrowhead Products Corp |
| Status | ACTIVE |
| Acquisition Status | ACTIVE |
| DEMIL Code | DEMIL Q — CCL Item — Commerce Control List |
| Hazard | No hazard code in the DLA record (HMIC N) |
| Criticality Code | X |
| Part Number | Manufacturer |
|---|---|
| 400771-2 PRIMARY | Arrowhead Products Corp (USA) |
| Reference | Meaning |
|---|---|
| LE591-0007-0002 | 7/2 Vendor item drawing reference The Boeing Company Div Legacy Am&m |
NSN 1660-01-167-5221 is a Insulation Pipe Covering,thermal, manufactured by Arrowhead Products Corp, classified under FSC 1660, Aircraft Air Conditioning, Heating, and Pressurizing Equipment. Status: active.
NSN 1660-01-167-5221 has 1 manufacturer part number on file: 400771-2 (Arrowhead Products Corp).
1 possible match (shared part number, not a government interchangeability claim): 5340-01-557-0971. Verify interchangeability with system specifications before substitution.
Key specifications for 400771-2: Special Features: C/O 4 BLANKET ASSY; 4 INNER FOIL 0.002 IN. TK; 4 OUTER FOIL 0.002 IN. TK; INSULATION,KAOWOOL 0.500 IN. TK; WASHERS AND CAPSTANS; B-1B ACFT IN. 0 specifications are documented in the U.S. Government catalog.
No hazard code in the DLA record (HMIC N). Hazard information on this page is shown exactly as it appears in the DLA record.
NSN 1660-01-167-5221 has DEMIL Code Q. Demilitarization may be required before disposal or transfer to non-military entities.
U.S. Government catalog: edition PUBLOGDVD v12.0.0 (OCT 2026), edition date 2026-10-01, retrieved 2026-10-16.
U.S. Government catalog: edition PUBLOGDVD v12.0.0 (OCT 2026), edition date 2026-10-01, retrieved 2026-10-18.